When comparing Blossom vs Eylean Board, the Slant community recommends Blossom for most people. In the question“What are the best online Kanban boards?” Blossom is ranked 16th while Eylean Board is ranked 23rd. The most important reason people chose Blossom is:
An update is posted to the Slack channel every time a task is created, completed, moved, or commented upon.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Slack integration
An update is posted to the Slack channel every time a task is created, completed, moved, or commented upon.

Pro Simple & clean interface
Design focuses on clarity.
Pro Simple and flexible
Very fluent and simple user interface. Non savvy users can learn very fast.
Pro Pricing
Pricing is friendly.
Pro Customization
Can be changed and modified to suit your work processes.
Pro Intuitive software
Cons
Con No free plan
There is no free plan like for personal use and the minimal cost of $19/month might be prohibitive.
Con Slack integration is really basic
There is no way to interact with tasks in any way - new tasks can't be added, completed tasks can't be removed, tasks can't be assigned, etc. The integration only sends updates to the Slack channel. There is also no way to fine-tune what updates get posted to Slack.
